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Old Mar 1, 2020 | 09:27 AM
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Default Thread size primary
Anyone know the thread size on the primary drain plug, I think it’s 3/8 28, don’t ask why
 
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Old Mar 1, 2020 | 10:05 AM
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Originally Posted by Numa Albornoz
Anyone know the thread size on the primary drain plug, I think it’s 3/8 28, don’t ask why
It's definitely not 3/8-24 so it's not a SAE thread.
It must be a NPT thread.
 
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Old Mar 1, 2020 | 10:57 AM
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Should be pipe thread ad 3/8 sounds right.
If it means a trip to hardware store get a couple different sizes.
The one or 2 I had to replace cause I LOST the dang things were cheap enough.

WP

LOL 3/8 would be a little big
as mentioned latter 1/8
 
Last edited by WP50; Mar 1, 2020 at 11:28 AM. Reason: wrong info
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Old Mar 1, 2020 | 11:01 AM
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Originally Posted by Numa Albornoz
Anyone know the thread size on the primary drain plug, I think it’s 3/8 28, don’t ask why
Well, it sort of depends on the year and model...

If it is the `98 in your sig, the plug would be a 1/8 pipe plug.
 
Last edited by Dan89FLSTC; Mar 1, 2020 at 11:12 AM.
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Old Mar 1, 2020 | 11:10 AM
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Originally Posted by Dan89FLSTC
Well, it sort of depends on the year and model...
LOL, I actually started this thread while on the road looking for stuff, 1997, Fxdl, I’m pretty sure all Evo primary drain plugs are the same though.
 
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Old Mar 1, 2020 | 11:12 AM
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Tell us why you need one, fess up!
 
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Old Mar 1, 2020 | 11:38 AM
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Evo primary drain plugs are all the same, but you didn`t tell us what you are working on...

1/8 pipe plug.

Part number 739A
 
Last edited by Dan89FLSTC; Mar 1, 2020 at 11:42 AM.
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Old Mar 2, 2020 | 08:46 AM
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yup 1/8 NPT, also has a magnet..
 
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Old Mar 2, 2020 | 08:51 AM
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Originally Posted by Dan89FLSTC
Evo primary drain plugs are all the same, but you didn`t tell us what you are working on...

1/8 pipe plug.

Part number 739A
Yup, I just bought two new ones for Primary and Tranny for fluid change. The old ones were original to my 96 FLSTN. Most dealers still carry them.
 
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Old Mar 6, 2020 | 07:27 PM
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1/8-27 National Pipe Taper.
 
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